Looks like Banded Garden Spider argiope trifasciata. Found on our fence in late afternoon..
Actually, I think you have two different species. This one’s ventral surface looks like Argiope Aurantia, the most common name is “banded garden spider.” Your other spider’s common name (allegedly, I’ve never heard anyone say it) is a “silver Argiope”
There is only one spider in the pic. The other one is it’s Shadow. 🙂
Sorry, I meant the other spider photo you posted. Is it the same spider or a different one. If it is the same one, this is the underside of Agiope trifasciata. Thank you for clarifying my answer 🙂